This subclass covers methods or apparatus specific to mining or quarrying

This subclass does not cover, even though they may be disclosed only for mining or quarrying, drill bits, bore reamers, core taking devices, drilling pipes or rods, handling, racking or connecting arrangements for drilling pipes or rods, counterboring or enlarging drilled holes, flame drilling, or other drilling apparatus, which are covered by subclass E21B

WARNINGS

The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups:

Slitting by unguided cutter cables or cutter chains, or by unguided tools drawn along the working face by cables or the like (dislodging by planing means E21C 27/32; propulsion by haulage cables E21C 29/14) [2013-01]

E21C 25/56

.

Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face, e.g. by a conveyor, by a guide parallel to a conveyor (pressing the conveyor equipped with tools towards the working face E21C 35/14) [2016-05]

E21C 25/58

.

Machines slitting by drilling hole on hole [2013-01]

E21C 25/60

.

Slitting by jets of water or other liquid (picks with arrangements of fluid-spraying nozzles E21C 35/187; distribution of spraying fluids in rotating cutter-heads E21C 35/23) [2013-01]

E21C 25/62

.

Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine [2013-01]

{Equipment associated with mining machines for sucking dust-laden air from the cutting area, with or without cleaning of the air} [2013-01]

E21C 2035/226

. .

{Control valves for the spraying liquid used in dust suppression systems} [2013-01]

E21C 35/23

. .

Distribution of spraying-fluids in rotating cutter-heads [2013-01]

E21C 35/24

.

Remote control specially adapted for machines for slitting or completely freeing the mineral (control in general G05) [2013-01]

E21C 37/00

Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C 27/14) [2013-01]

E21C 37/005

.

{by projectiles} [2013-01]

E21C 37/02

.

by wedges [2013-01]

E21C 37/04

.

by devices with parts pressed mechanically against the wall of a borehole {or a slit} [2013-01]

E21C 37/06

.

by making use of hydraulic or pneumatic pressure in a borehole [2013-01]

E21C 37/08

. .

Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole {(E21C 37/10 takes precedence)} [2013-01]

E21C 37/10

. .

Devices with expanding elastic casings [2013-01]

E21C 37/12

. .

by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid (slitting by jets of water E21C 25/60; blasting by explosives F42D) [2013-01]

E21C 37/14

. .

by compressed air; by gas blast; by gasifying liquids [2013-01]

E21C 37/16

.

by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B 7/14) [2013-01]